To remove lead from a contaminated water solution, a chemist decides to precipitate it out by adding sodium chloride to the solution. From 108.7 g of the solution with a density of 1.03 g/mL, the chemist recovers 0.152 g of PbCl2. What is the concentration of Pb2+in the original solution in molarity?

The concentration of Pb²⁺ in the original solution in molarity is 0.00518 M/L

Explanation:

Given;

mass of the solution = 108.7g

density of the solution = 1.03 g/mL

Volume of solution = mass of the solution/density of the solution

Volume of solution = 108.7/1.03 = 105.53 mL

Number of mole of PbCl₂ = Reacting mass/molar mass

molar mass of PbCl₂  = (207.2 + 71) = 278.2 g/mol

Number of mole of PbCl₂ = (0.152/278.2) = 0.000546 M

PbCl₂ ⇄ Pb²⁺ + 2Cl⁻

1          :    1      :  2

1 mole of PbCl₂ = 1 mole of Pb²⁺

0.000546 mole of PbCl₂ = 0.000546 mole of Pb²⁺

Molarity of Pb²⁺ = (number of moles of Pb²⁺)/(Liters of solution)

Molarity of Pb²⁺ = (0.000546 mole)/(105.33 X 10⁻³L)

Molarity of Pb²⁺ = 0.00518 M/L

Therefore, the concentration of Pb²⁺ in the original solution in molarity is 0.00518 M/L

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

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